Lifting jack



Feb. 12 1924. 1,483,843

Y w. J. COSTELLO LIFTING JACK Filed Sept.. 9, 1922 Patented Feb. l2, 1924.

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WILLIAM: J. cos'rELLo, or Penn frownsnrr, ALLnannnv coUNrY, rENNsYLvANrA,

ASSIGNOR OF ONE-HALF TO JOSEPH E. KATZ, OF VERONA, PENNSYLVANIA. l

LIFTING" JACK.

Application met september 9, ma seria 10.587,062.

To all whom t may cof/wem.' f

Be it known that I, VVILLLAM J. COSTELLO, residing at Penn Township, in the county of Allegheny and State of Pennsylvania, a citizen yof' the lUnited States, haveiinvented or discovered certainynew and useful lmprovements in Lifting'rlacks, of which im provement the following is specification.v

The invention described herein relatesjto certain improvements in liftingvjaclis, said improvements rendering the jack. especially useful in rail-road workand `also for the liftingV of automobiles, trucks, and passenger n cars. The improvements are hereinafter lamorefully described and claimed.

yIn the accompanying drawings forming` a part of this specification, Fig. 1 is aside elevation of the improved jaclgthe lifting lever being shown in its position justprior` to the beginning of the lifting movement;

Fig. 2 shows a portion of the jack in section the lifting lever and-holding pawl being shown in the positions they will occupy when the former has nearly completed its downward or lifting movement; Fig. 3 is a view similar to Fig. 2 the lever having completed its downward movement; Fig. 4 shows the positions of the lever and holding pawl at the beginning of the operation of lowering the vertically movable bar step by step; Fig. 5 shows the position of the lever and pawl as the lever is about to be disengaged from the bar and pushing the pawl into engagement with the bar, and Fig. 6

is a sectional detail view, the plane of secion being indicated by the line VI-V,

In the practice of the invention the base 1 and hollow standard 2 are preferably 4.o formed integral with each other, the standard having slots in opposite sides and also withspaced wings 2a on one side. The lifting bar 3 which is provided along one side with teeth 4 as is the usual practice, and

with a foot 5 on the side opposite that on which the teeth are formed, is inserted into the hollow standard through `openings in the base, and on its upper end is secured a head 6. The lifting lever'? which is pro` vided with teeth 8 adapted to engage the teeth on the lifting bar, is provided with a slot 9 through which passes the pivot pin 10. This slot is made of such a length as to permit of sufficient longitudinal movement of the lever as to disengage the teeth the rod will be shifted to cause the engage the teeth on the bar.

`,In order to prevent a disengagement of the teeth of the leverwhen moving up or down,

.a curved recess 1l is formed at 'the outer end of the slot adapted to engagey the pin. Thef", holding pawl 12 is rsecuredfon va pin. 13 having bearings in the wings 2@ and` projecting atthe end beyond the wings.y On the prof jecting end ofthe pin,a headv 14 is formed or secured andis provided with a transverse ,y Vopening 1n which is lslidably mounted a rod ,A

l'having knobs or weights 16y at its ends so that by shifting the rodthrough the opent in the head one or the other .of the knobs `VVhenit is desired to lower ythe bar step `by' step,the rod will be shifted to the right` irl-Figs.y 1 and 4,` such a distancethat the 'frightfhand knob will become veflective to lmove the pawlout of engagement lwith the lifting bar, but in order that the pawl may be pushed into engagement with the bar by a cam face on the lever as hereinafter described, the outward movement of the pawl by the weight should be limited. To this end a stop 17 is arranged in the path of the rod, said stop being so located that the outward movement of the pawl will be arrested when its point is clear of the teeth on the lifting bar, as shown in Fig. 4. When lowering the lifting bar step by step, the lever is moved longitudinally to disengage its teeth from the bar, its outer end lowered, and the lever moved inwardly to engage teeth higher up on the bar. The weighted rod is then shifted to the right andthe outer end of the lever depressed to raise the bar sufliciently far to release the pawl which will then be moved outwardly by the weighted bar to the position indicated in Fig. 4. The outer end of the lever is then permitted to be raised by the weight onthe bar. The lever is formed with a cam surface 18 on its underside which will bear on the pawl when in the position shown in Fig. 4, and push the pawl into engagement with the bar as the inner end of the lever moves down.

When it is desired to drop the lifting bar.

the weighted rod is moved suihciently far to the right to permit the left hand end of the rod to pass beyond the stop 17, so that when the lever is depressed to `raise the lifting bar and release 'the pawl the latterr will base@ bellow"Staillagrdiha,ngAVA Y side, 'tthe'dflftnb arranged in the atender, enlever `'havini; teeth and long dinallly movable on its be moved by the weighted :bar to the iposi-V tion shown by dotted lines in Figul. The

outer 'end ofthe lever is permitted to `move Y up until. its teeth lpass out of engagement with the teeth on the bar.. In order that the weighted rod may not be shifted too yfar' to the right when it is desired to lower the vlifting bar step by step, a rib A#19"is so formed on the `rod that its end will bear against the kheadv 14;, when the rod has reaeh'ed "proper position for `astep by step lowering, In

order to 'permit 'the weighted lrod vto be 'movedtoa Yposition 'where it will .the

Y the teethV on the lever with. :the teeth o n the liftingA bar, hldg pavl adapted it@ engelse the lifting bei* and a 'Weghtedrinember movable relative to. the pawlfand adaptedA when in onepesitibn to ,move the pawl in engagement With "the lifting bei* .and in itsV my hand.

other position'to move the pawl out of engag'ement with the lifting bar.

2.' A lifting jack having in eombin ation a base, a hollow standard, having a slot in one side, a toothed lifting lbar arranged in the standard7 a lever having teeth to engage the lifting bar, and longitudinally movable on its pivotal support into and out of engagement`with the'l'i'fting bar, a pin rotatably mounted in the standard and carrying a pawl to engage the lifting bar, a rod having weights on its ends and movable transversely of the pawl pinto shift the pawl into vand out of engagement with the lifting bar.V

3. A lifting jack having in combination a base, ja hollow standard having 'a slotted. sideV a toothed lifting bar arranged in the standard, a lever having teeth to engage the liftingihar vand longitudinally movable onl its', pivotal support into and out of engage? ment with the lifting bar, aV pinrotatably mounted ion thestandard, a pawl carried by the pin, a rod movable transversely of the sides ofthe pin, a `stop for limiting the .movement ofthe pawl away from the liftingjbar and a stop for limiting `the longitudinal movement of the rod.

In testimony WILLIAM J. COSTELLO.

'pinand provided with weights on'opposite whereof, I have lhereunto set i 

